Catastrophic bearing failure was the main cause of this spindle malfunction Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication……
Read MoreHitachi Seiki HS630 Spindle Repair
The Hitachi Seiki HS630 is a twin pallet CNC horizontal machining center made for high production cutting. It comes equipped with an oil mist lubricated and stator driven spindle capable of running up to 4,000 rpm.
CHALLENGE
Our customer sent in this Hitachi Seiki HS630 spindle after it had suffered a catastrophic rear bearing failure. Upon disassembly, we noted that the rear bearing journal was undersized by -4/-7 microns (ISO is +/- 5) with fretting. The tooling taper was also pock marked and should be addressed. Lastly the drawbar was wet with coolant, which indicates that the rotary union was leaking and would need to be replaced.
SOLUTION
The following actions were performed on this Hitachi Seiki HS630 spindle:
- Clean, inspect overall dimensions
- Replace bearings, bolts, and o-rings
- Grind, chrome plate, and finish grind the 85mm rear journal
- Kiss grind the taper
- Customer to replace rotory union
RESULT
After reassembly of all components, adjusting bearing preload, and undergoing break-in and testing procedures, this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.
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